a(n) = n! * Sum_{k=0..n} (-1)^(n-k) * binomial(k+2,3) / k!.
A368585
a(n) = n! * Sum_{k=0..n} (-1)^(n-k) * binomial(k+2,3) / k!.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =4a(4) =4a(5) =15a(6) =-34a(7) =322a(8) =-2456a(9) =22269a(10) =-222470a(11) =2447456a(12) =-29369108a(13) =381798859a(14) =-5345183466a(15) =80177752670
External references
- oeis: A368585